US8542645B2 - Technique for transmitting on multiple frequency resources in a telecommunication system - Google Patents

Technique for transmitting on multiple frequency resources in a telecommunication system Download PDF

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US8542645B2
US8542645B2 US13/119,512 US200913119512A US8542645B2 US 8542645 B2 US8542645 B2 US 8542645B2 US 200913119512 A US200913119512 A US 200913119512A US 8542645 B2 US8542645 B2 US 8542645B2
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dft
modulation symbols
component carriers
output
ofdm
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US20110171966A1 (en
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Stefan Parkvall
Robert Baldemair
Erik Dahlman
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]

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  • the present invention relates to a method and arrangement in a telecommunication system, in particular to a technique for handling the aggregation of multiple frequency resources in an evolved Universal Terrestrial Radio Access Network or similar telecommunication network.
  • LTE Long-Term Evolution
  • UTRAN Universal Terrestrial Radio Access Network
  • 3GPP 3rd Generation Partnership Project
  • OFDM Orthogonal Frequency Division Multiplexing
  • Power amplifiers have to be designed to meet peak transmission power requirements while still meeting network requirements regarding the average output power (for example, determining the achievable data rate and coverage).
  • the difference between the peak power and the average power determines the so-called amplifier back-off and is thus a measure on how much the power amplifier needs to be “over dimensioned” (or, equivalently, how much is lost in coverage when using the same amplifier but a lower-performance transmission scheme).
  • a high PAR implies a larger power back-off in the power amplifier, that is, the power amplifier cannot be used to its full extent.
  • the Cubic Metric (CM) is another, generally more accurate metric, that can be used to represent the amount of back-off required in the power amplifier.
  • power amplifier metric (denoting, e.g., PAR, CM, or any other appropriate measure) is used which shall be generally understood as a measure representing the impact of the difference or ratio between the peak power and the average power on the power amplifier design.
  • LTE has adopted a single-carrier transmission scheme with low power amplifier metric known as DFT (Discrete Fourier Transform)-spread OFDM (DFTS-OFDM) or DFT-precoded OFDM (sometimes also referred to as Single-Carrier Frequency Division Multiple Access, or SC-FDMA).
  • DFT Discrete Fourier Transform
  • SC-FDMA Single-Carrier Frequency Division Multiple Access
  • FIG. 1 is a schematic illustration of an example of an SC-FDMA transmitter stage 100 operable to transmit on a single carrier according to the LTE transmission scheme.
  • DFT coder 105 is coupled to OFDM modulator 110 which in turn is coupled to power amplifier 120 through a cyclic-prefix insertion stage 115 operable to insert a cyclic prefix in the output from OFDM modulator 110 before the output is amplified by power amplifier 120 for transmission over carrier 125 .
  • carrier 125 has a bandwidth of 20 MHz.
  • Carrier 125 may be referred to as a frequency resource for the transmission of a set of data blocks. While in FIG. 1 , carrier 125 is shown as having a 20 MHz bandwidth, other bandwidths are possible in the LTE transmission scheme, and the bandwidth may vary (e.g., depending on the number of symbols to be transmitted via carrier 125 ).
  • Modulation symbols 101 are input to DFT coder 105 and the output of DFT coder 105 is mapped to selective inputs of OFDM modulator 110 .
  • OFDM modulators comprise an Inverse Fast Fourier Transform (IFFT).
  • IFFT Inverse Fast Fourier Transform
  • the output of OFDM modulator 110 contains the data of modulation symbols 101 (“OFDM symbols”) and is amplified by power amplifier 120 for transmission over carrier 125 .
  • the DFT size determines the instantaneous bandwidth of the transmitted signal while the exact mapping of the DFT coder output to the input of the OFDM modulator 110 determines the position of the transmitted signal within the overall uplink transmission bandwidth.
  • a cyclic prefix is inserted subsequent to OFDM modulation. The use of a cyclic prefix allows for straightforward application of low-complexity frequency-domain equalization at the receiver side.
  • LTE-Advanced In order to meet requirements for International Mobile Telecommunications-Advanced (IMT-Advanced), 3GPP has initiated work on LTE-Advanced.
  • One aspect of LTE-Advanced is to develop support for bandwidths larger than 20 MHz.
  • Another aspect is to assure backward compatibility with LTE Rel-8.
  • Backward compatibility also includes spectrum compatibility.
  • an LTE-Advanced spectrum or carrier that is wider than 20 MHz may appear as a number of separate LTE carriers to an LTE Rel-8 terminal.
  • Separate LTE carriers may be referred to as different frequency resources.
  • each Rel-8 LTE carrier can be referred to as a single frequency resource.
  • Frequency resource aggregation implies that an LTE-Advanced terminal can receive and transmit on multiple frequency resources, where each frequency resource may have, or may be modified to have, the same structure as a Rel-8 LTE carrier.
  • Frequency resources 210 in FIG. 2 are all located next to each other so as to be contiguous.
  • each frequency resource has a bandwidth of 20 MHz.
  • the five frequency resources 210 shown in FIG. 2 aggregate to an aggregated bandwidth of 100 MHz.
  • the frequency resource aggregation shown in FIG. 2 requires that the operator has access to a contiguous spectrum allocation which can be divided to achieve the number of aggregated frequency resources. While in the drawings frequency resources are shown having a bandwidth of 20 MHz, this is for purpose of illustrating a backwards compatible spectrum allocation. Generally, individual frequency resources may have any bandwidth depending upon the number of included subcarriers.
  • LTE-Advanced may also support aggregation of non-contiguous spectrum fragments, which may be referred to as spectrum aggregation, an example of which is illustrated in FIG. 3 .
  • spectrum aggregation an example of which is illustrated in FIG. 3 .
  • five frequency resources 210 are spectrum aggregated to provide an aggregated bandwidth of 100 MHz.
  • One or more frequency resources 210 are separated by spectrum gaps 320 which separate the one or more frequency resources 210 such that those frequency resources 210 separated by spectrum gaps 320 are not contiguous.
  • Spectrum aggregation allows for the flexible addition of spectra for transmission. For example, an operator may bring into use different spectrum fragments over time depending upon availability for use by the operator.
  • the DFTS-OFDM property of a relatively low power amplification metric should be maintained as much as possible when extending the transmission bandwidth across multiple frequency resources, as for example, part of achieving or adding spectra to an LTE-Advanced system (e.g., having a spectrum allocation such as that shown in FIG. 3 ).
  • LTE-Advanced system e.g., having a spectrum allocation such as that shown in FIG. 3
  • the structure of transmitter stage 100 of FIG. 1 may be generalized to transmit on one or more distinct frequency resources as shown in FIG. 4 .
  • FIG. 4 is a schematic illustration of an example of such a generalized transmitter stage 400 operable to be compliant with LTE-Advanced by transmitting on multiple frequency resources.
  • DFT coder 105 is coupled to OFDM modulator 110 which in turn is coupled to power amplifier 120 through a cyclic-prefix insertion stage 115 operable to insert a cyclic prefix in the output from OFDM modulator 110 before the output is amplified by power amplifier 120 for transmission over different frequency resources 410 a , 410 b.
  • transmitter stage 400 may be operable to receive modulation symbols 401 for transmission on frequency resources 410 a , 410 b substantially simultaneously.
  • frequency resources 410 a and 410 b are separated by spectrum gap 420 and are hence non-contiguous.
  • each frequency resource 410 has a bandwidth of 20 MHz, thus the spectrum aggregation of the two frequency resources yields a total bandwidth of 40 MHz.
  • DFT coder 105 and OFDM modulator 110 are scaled to match the larger bandwidth.
  • the output of DFT coder 105 is connected to the input of OFDM modulator 110 .
  • the control signaling on the Physical Uplink Control Channel may be located at each of the band edges of the LTE uplink, that is, for example, at the band edges of each frequency resource.
  • the structure shown in FIG. 4 is sometimes referred to as Clustered DFTS-OFDM (CL-DFTS-OFDM), where the term clustered refers to the fact that the frequency resources are not necessarily contiguous in frequency but located close to each other.
  • the power amplifier metric of the generated signal is higher than that of conventional DFTS-OFDM, as shown, for example, in FIG. 1 , but still low compared to OFDM and increases with the number of clusters.
  • a method of transmitting modulation symbols on multiple frequency resources includes applying a DFT coding per set of modulation symbols of two or more sets of modulation symbols, wherein a first set of modulation symbols from the two or more sets of modulation symbols is to be transmitted on a set of frequency resources handled by the same power amplifier. Then, OFDM modulation is applied to the sets of DFT coded modulation symbols to output a first set of OFDM symbols for transmission on a set of frequency resources, and to output another set of OFDM symbols for transmission on at least one frequency resource distinct from the set of frequency resources used to transmit the first set of modulation symbols.
  • the output of the OFDM modulator carrying the first set of modulation symbols to be transmitted over the set of frequency resources is amplified by a power amplifier exclusive of the power amplification of the output to be transmitted over other frequency resources.
  • power amplification per set of frequency resources is achieved.
  • a system operable to implement the above method includes a transmitter stage adapted to transmit modulation symbols on multiple frequency resources.
  • the functionality of the transmitter stage may be implemented with multiple stages and components.
  • the transmitter stage may include a first DFT coder operable to receive modulation symbols to be transmitted and a second DFT coder operable to receive modulation symbols to be transmitted on a set of frequency resources.
  • a first OFDM modulator is associated with said first DFT coder and coupled to said first DFT coder to receive output from the first DFT coder, and operable to output OFDM symbols for transmission on at least one frequency resource distinct from the set of frequency resources.
  • the transmitter stage further includes a second OFDM modulator associated with the second DFT coder and coupled to the second DFT coder to receive output from said second DFT coder, and operable to output OFDM symbols for transmission on the set of frequency resources.
  • a first power amplifier is coupled to receive output of the first OFDM modulator and is operable to amplify said output for transmission on said at least one frequency resource.
  • a second power amplifier is coupled to receive said output of the second OFDM modulator to and operable to amplify the output for transmission on the set of frequency resources.
  • each frequency resource may have a spectrum bandwidth spanning a frequency range compatible in bandwidth to a telecommunication system spectrum bandwidth.
  • the spectrum bandwidth may be defined by the spectrum (e.g., carrier) bandwidth of a legacy telecommunication system.
  • each frequency resource may thus be defined by the spectrum bandwidth of an LTE system (of typically 1.25/2.5, 5, 10, 15 or 20 MHz).
  • the above-described transmitter stage may further comprise a third DFT coder operable to receive modulation symbols to be transmitted on a second set of frequency resources, wherein the frequency resources of the second set of frequency resources are distinct from the other frequency resources, and a third OFDM modulator coupled to said third DFT coder to receive output from said third DFT coder, and operable to output OFDM symbols for transmission on the second set of frequency resources.
  • a third power amplifier may be coupled to receive the output of the third OFDM modulator and operable to amplify the received output for transmission.
  • a terminal comprising the above-described transmitter stage may be operable to negotiate with the network, be instructed by the network or decide autonomously to use the second (or any further) DFT coder and/or transmit on a set of frequency resources.
  • the second DFT coder is coupled to receive modulation symbols from a demultiplexing stage.
  • the second power amplifier may further be coupled to receive the output of the second OFDM modulator through a cyclic-prefix insertion stage operable to insert cyclic-prefixes in said output from said second OFDM modulator.
  • Demultiplexing one or more inputs may be used to input modulation symbols to DFT coders. Because frequency resources may be aggregated across a frequency spectrum in a discontinuous manner, a set of frequency resources may be non-contiguous with other frequency resource(s).
  • each set of frequency resources comprises a limited number of frequency resources.
  • a DFT coding may be applied per a limited number of frequency resources and output to be transmitted over the limited number of frequency resources may be amplified by an associated power amplifier.
  • a set of frequency resources comprises contiguous frequency resources in the same frequency band.
  • Non-contiguous frequency resources may be allocated from non-contiguous spectrum fragments (in, e.g., different frequency bands) as spectrum is used by or made available to an operator.
  • Individual power amplifiers may be associated with individual continuous or non-contiguous frequency resources or sets of continuous, non-contiguous frequency resources.
  • OFDM modulator output for transmission over a non-contiguous frequency resource or a set of non-contiguous frequency resources may be amplified per power amplifier, thus yielding a relatively low power amplifier metric per power amplifier.
  • the techniques presented herein may be realized in the form of software, in the form of hardware, or using a combined software/hardware approach.
  • a computer program product comprising program code portions for performing the steps presented herein when the computer program product is run on one or more computing devices may be provided.
  • the computer program product may be stored on a computer-readable recording medium such as a memory chip, a CD-ROM, a hard disk, and so on.
  • the computer program product may be provided for download onto such a recording medium.
  • FIG. 1 schematically illustrates an example transmitter implementation for transmitting on a frequency resource.
  • FIG. 2 illustrates an example of carrier aggregation over a contiguous spectrum.
  • FIG. 3 illustrates an example of carrier aggregation over a non-contiguous spectrum.
  • FIG. 4 schematically illustrates an example transmitter implementation for transmitting on multiple frequency resources.
  • FIG. 5 shows a flow diagram of a method embodiment for implementing a transmitter operable to transmit on multiple frequency resources.
  • FIG. 6 schematically illustrates an embodiment of a transmitter implementation for transmitting on multiple frequency resources.
  • FIG. 7 shows a flow diagram of a method embodiment for transmitting on multiple frequency resources.
  • LTE-Advanced systems are designed to transmit across bandwidths and spectra exceeding 20 MHz.
  • the bandwidth or spectrum transmitted upon by an LTE-Advanced system is separated into frequency resources (sometimes called “component carriers”) which are themselves backwards compatible.
  • a frequency resource may be a component carrier as utilized by an LTE legacy system.
  • a component carrier, and thus a frequency resource may have a bandwidth up to 20 MHz and may be composed of resource blocks (comprising sub-carriers) which may be transmitted over.
  • a frequency resource may be thought of as a series of resource blocks having a bandwidth spanning a portion of a spectrum and existing for a span of N consecutive symbols in the time domain.
  • Such time domain symbols may be OFDM (e.g., SC-FDMA) symbols, and the bandwidth of the resource block may span or include M consecutive subcarriers.
  • a resource block is a block of N ⁇ M resource elements. Accordingly, LTE-Advanced systems have the potential to transmit upon multiple frequency resources, the individual frequency resources having the potential for different bandwidths. Examples of resource blocks are further discussed in the 3GPP Technical Specification 36.211 V8.7.0 (2009-05).
  • transmitter stage 100 depicted in FIG. 1 may be generalized to allow for transmission on multiple frequency resources substantially simultaneously, as, for example, shown in FIG. 4 .
  • a generalized transmitter stage such as that shown in FIG. 4 , exhibits an increasing power amplifier metric as the number of frequency resources scheduled for or handled by the transmitter increases.
  • the increasing power amplifier metric requires that a correspondingly larger power back-off has to be built into the power amplifier of the generalized transmitter stage shown in FIG. 4 . Building such a larger power back-off into a transmitter stage increases the overall size of the transmitter stage, thus undesirably bulking up the transmitter and causing increased power consumption.
  • the following embodiments apply a DFT coding per set of frequency resources as will be discussed below with reference to FIGS. 5 to 7 . Because numerous frequency resources are divided into sets of frequency resources, each set of frequency resources has a limited number of frequency resources. Thus, DFT coding applied to a set of frequency resources is applied to a limited number of frequency resources.
  • the transmitter stage may also include multiple power amplifiers. Output for transmission over each set of frequency resources may be amplified at different power amplifiers such that each set of frequency resources is associated with an individual power amplifier and output transmitted over the set of frequency resources amplified by that amplifier. By amplifying output to be transmitted on sets of frequency resources per associated power amplifier, the power amplifier metric per power amplifier may be kept relatively low. Thus, the power back-off built into the power amplifier(s) may be reduced. In one aspect, reducing the number of non-contiguous frequency resources that are encoded by a single DFT reduces the power amplifier metric for the associated power amplifier.
  • a terminal operable to transmit on multiple frequency resources such as, for example, in the uplink.
  • the frequency resources are divided into sets such that a limited number of frequency resources form a set: output to be transmitted on each set will later be amplified for transmission using different power amplifiers, one power amplifier per set, as discussed above.
  • Frequency resources in each set are transmitted on utilizing clustered DFTS-OFDM (CL-DFTS-OFDM) with different CL-DFTS-OFDM modulators used for the different sets.
  • CL-DFTS-OFDM clustered DFTS-OFDM
  • Such a structure can be referred to as Multi-Carrier CL-DFTS-OFDM (MC-CL-DFTS-OFDM).
  • FIG. 6 schematically illustrates an example of such an MC-CL-DFTS-OFDM system that may be implemented in a terminal such as a mobile telephone, a data card or a portable computer.
  • FIG. 5 is a flow diagram of a method embodiment for operating a transmitter stage 600 as shown in FIG. 6 .
  • multiple DFT coders 605 are provided.
  • multiple OFDM modulators 610 are likewise provided.
  • the DFT coders 605 are coupled to their respective associated OFDM modulators 610 .
  • multiple power amplifiers are provided and at step 505 , the OFDM modulators 610 are coupled to their respective associated power amplifiers 620 .
  • each DFT coder 605 is coupled to an associated OFDM modulator 610 which in turn is coupled to an associated power amplifier 620 through a cyclic-prefix insertion stage 615 .
  • Each cyclic-prefix insertion stage 615 is operable to insert a cyclic prefix in the output from the respective OFDM modulator 610 before the output is amplified by the power amplifier 620 associated with the respective OFDM modulator 610 .
  • each individual power amplifier 620 amplifies OFDM modulator output for transmission over a set of frequency resources.
  • the DFT coding of DFT coders 605 is applied per set of frequency resources such that modulation symbols coded by a DFT coder 605 are transmitted on a set of frequency resources located closely to each other in frequency (e.g., in the same frequency band).
  • a DFT coding is applied per set of frequency resources and data output on a set of frequency resources is individually amplified by an associated power amplifier.
  • Each set of frequency resources can have a limited number of frequency resources such that a DFT coding and corresponding OFDM modulation is applied per a limited set of frequency resources.
  • the power amplification metric is reduced. More particularly, in one aspect, reducing the number of non-contiguous frequency resources coded with a DFT reduces the power amplification metric. This reduces the amount of back-off required in individual power amplifiers 620 receiving output from OFDM modulators 610 .
  • the frequency resources forming a set of frequency resources are contiguous frequency resources in the same frequency band. This may also reduce the power amplification metric.
  • a stream of modulation symbols is provided to DFT coders 605 by a demultiplexing stage 601 .
  • demultiplexing stage 601 can supply modulation symbols to each of DFT coders 605 such that each DFT coder 605 may be operable to output coded modulation symbols to its associated OFDM modulator 610 to allow the OFDM modulators 610 to output OFDM symbols for transmission on frequency resources substantially simultaneously.
  • demultiplexing stage 601 may supply modulation symbols to DFT coder 605 b .
  • DFT coder 605 b may apply a DFT coding to the modulation symbols and pass the DFT-coded modulation symbols on to associated OFDM modulator 610 b .
  • OFDM modulator 610 b may then output OFDM symbols for transmission on frequency resources 650 b and 650 c.
  • FIG. 7 is a flow diagram of a method embodiment for transmitting modulation symbols, which may be performed utilizing a transmitter stage such as transmitter stage 600 shown in FIG. 6 .
  • a DFT coding is applied by DFT coders 605 per set of symbols to be transmitted on the associated set of frequency resources.
  • OFDM modulation is applied by the respective OFDM modulators 610 per set of DFT coded symbols to output sets of OFDM symbols for transmission on sets of frequency resources.
  • a cyclic-prefix is inserted at cyclic-prefix insertion stage 615 .
  • power amplifiers 620 amplify modulator output for transmission over sets of frequency resources such that each power amplifier 620 amplifies output for transmission over an associated set of frequency resources.
  • power amplifier 620 a amplifies output from OFDM modulator 610 a for transmission over frequency resource 650 a .
  • Power amplifier 620 b amplifies output from OFDM modulator 610 b for transmission over the set of frequency resources comprising frequency resource 650 b and frequency resource 650 c .
  • Power amplifier 620 c amplifies output from OFDM modulator 610 c for transmission over the set of frequency resources comprising frequency resource 650 d and frequency resource 650 e . Because the sets of frequency resources include a limited number of frequency resources, each DFT coding, OFDM modulation and power amplification is applied per a limited number of frequency resources, reducing the power amplification metric per power amplifier.
  • Frequency resource 650 a is separated from the frequency resources associated with power amplifier 650 b by gap 660 a .
  • the frequency resources associated with power amplifier 650 b are separated from the frequency resources associated with power amplifier 650 c by gap 660 b .
  • frequency resources 650 may be spectrum aggregated to achieve an aggregated bandwidth for the transmission of modulation signals or other data utilizing transmission stage 600 of FIG. 6 .
  • a transmitter stage can be selected or configured which approximates one of the transmitter stages shown in FIG. 4 or FIG. 6 .
  • the selection of which structure to use for an uplink transmission may depend on the number of frequency resources that a terminal is scheduled to transmit upon. For example, in the event that a terminal has sufficient individual power amplifiers to amplify modulation output for transmission on each scheduled frequency resource individually, output to be transmitted on the frequency resources may be individually amplified, one frequency resource per power amplifier, as opposed to being amplified per sets of more than one frequency resources.
  • the structure to be used is determined based on the number of power amplifiers allocated per user.
  • the terminal and the network may negotiate which structure to use for different scenarios. For example, in a scenario where the number of frequency resources a terminal is scheduled to transmit on is less than or equal to the available power amplifiers, the power amplifiers may each amplify modulator output for transmission over a single frequency resource, even if the spectrum is contiguous.
  • the techniques disclosed herein provide an approach for transmitting and a transmitter stage yielding a power amplifier metric that is low when transmitting utilizing multiple frequency resources in an LTE-Advanced system. Further advantages of the disclosed techniques include maintaining a low power amplifier metric when transmitting over either frequency resource or spectrum aggregation aggregated spectra.
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